JPH03257501A - On-line tuning method for function generator of digital controller - Google Patents

Abstract

PURPOSE:To attain the change of the set value via an on-line system by designating previously the set value to be changed in a prepared set value area and then transferring totally this set value area to the same area of a function generator. CONSTITUTION:A changing set value area 3 is prepared in a function generator 1 and an area transfer instruction 4 is carried out. Thus the set value is totally transferred to a set value area 2 of the generator 1. The instruction 4 is carried out when an execution instruction 5 is carried out with an access C given from a maintenance tool 11 and then a transfer instruction execution signal (d) is inputted to the instruction 4. Meanwhile the signal (d) is inputted to a clear instruction 6 and outputted as a transfer instruction execution clear signal (e). This signal (e) is inputted to the instruction 5. In such a constitution, the set value of the generator 1 is changed in an on-line system and furthermore the tool 11 is just required to perform an access to the instruction 4 only.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an online tuning method for a function generator in a digital control device.

(Prior Art) As shown in FIG. 2, a conventional online tuning method for a digital control device uses a maintenance tool 11 to change the set value of a function generator 1 used in an operating digital control device IO. I was going there. That is, in order to change the setting values, the maintenance tool II is generally used to directly access each setting value C in the setting value area 2 of the function generator.

(Problems to be Solved by the Invention) It is impossible to change the set value area 2 of the function generator 1 in the digital control device 10 in operation online as described above due to the sensitive nature of the system.

However, when the function generator 1 is used to compensate for control characteristics, etc., it may not be possible to formally determine the function without actually operating the digital control device IO. In this case, the setting value area 2 of the function generator 1 is tentatively determined.

In addition, in large plants such as power plants, this function generator 1
It is not possible to stop the plant in order to reset the set value area 2.

Therefore, it is necessary to change the settings online (while the digital control device is operating). In order to change the settings online, a plurality of setting values in the setting value area 2 of the function generator 1 must be changed at once. That's the third
This will be explained using figures.

FIG. 3(A) shows the set value area 2 of the function generator, and FIG. 3(B) shows the relationship between the input signal a and the output signal S of the function generator 1.

As can be seen from FIG. 3, in order to convert the input signal a of the function generator 1 into the output signal of the function generator 1, a large number of bending points are required, depending on the characteristics of the function. Furthermore, since the X-axis setting value and the y-axis setting value are set for each bending point, twice the number of bending points is required.

Also, many setting values need to be changed online.
There are constraints that must be changed in the control cycle. If the change is not made within one control cycle, a process will occur where the characteristics of the function become unintended during the change.

This process could not be avoided using conventional online tuning methods.

The present invention has been made in view of the above, and an object of the present invention is to enable setting values to be changed online using a skewer that changes the setting values of function generators in a digital control device all at once.

[Structure of the invention] (Means and effects for solving the problem) In order to solve the above-mentioned problem, the setting value to be changed is specified in a set value area prepared in advance, and the setting value area is All set values of the function generator can be changed in one control cycle by transferring them all at once to the set value area of the function generator.

(Example) FIG. 1 shows an online tuning method in a digital controller IO having a function generator according to the present invention.

In the present invention, a setting value area 3 for change of the function generator 1 is prepared in advance, and setting values are transferred all at once to the setting value area 2 of the function generator by executing an area transfer command 4.

The area transfer command 4 is executed by executing the execution command 5 by access C from the maintenance tool 11, and by inputting the transfer command execution d to the area transfer command 4.

Further, the transfer instruction execution signal d is input to the clear instruction 6, output as a rear signal e for executing the transfer instruction, and input to the execution instruction 5.

Due to this operation, the area transfer instruction 4 is executed only once for each access C to the execution instruction 5 from the maintenance tool. Note that the settings in the change setting area 3 can be changed online or offline as in the past, but the change setting area 3 is normally set in the function generator 1.
There is no problem since it is not used for this purpose.

[Effects of the Invention] As described above, according to the present invention, set values are transferred all at once to a pre-prepared changed setting value area by an area transfer command, so all set value changes can be made within one control cycle. This makes it possible to change the setting values of the function generator online, and by accessing only the area transfer command from the maintenance tool.

[Brief explanation of drawings]

ff11 is an explanatory diagram of the online tuning method according to the present invention, FIG. 2 is an explanatory diagram of the conventional online tuning method, and FIGS. 3(^) and (B) are explanatory diagrams of the function generator. 1...Function generator 2...Function generator setting value area 3...Pre-prepared setting value area 4...Area transfer instruction 5...Execution instruction 6...
Clear command lO...Digital control device 11.
・Maintenance tools

Claims (1)

[Claims] An online tuning method in a digital control device having a function generator, characterized in that changes can be made online by using a command to collectively transfer the set value area of the function generator.